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Electrical Machines

Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 2
 4
 1
 8

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Electrical Machines
Stepper motor is used in

 food processing
 computer printers
 traction
All of these

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Electrical Machines
DC series motor is best suited for electric traction as

 It runs at very high speed at light load.
 It consume less power.
  It develops high starting torque.
 It is cheaper in cost.

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Electrical Machines
Maximum allowable moisture content of power transformer insulating oil is generally taken as

  35 ppm.
 20 ppm.
 25 ppm.
 45 ppm.

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Electrical Machines
In DC generators, the residual magnetism is of the order of

  20 %.
  15 %.
  2.5 %.
 10 %.

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Electrical Machines
A DC series motor drawing an armature current of Ia is operating under saturated magnetic conditions. The torque developed in the motor is proportional to

 I/Ia2
 1/Ia
 Ia
 Ia2

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